content: /**
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
   * compliance with the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software distributed under the License is
   * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
   * the License for the specific language governing permissions and limitations under the License.
   */
  
  package io.reactivex.observable.internal.operators;
  
  import static org.junit.Assert.*;
  import static org.mockito.ArgumentMatchers.*;
  import static org.mockito.Mockito.*;
  
  import java.util.List;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.atomic.AtomicBoolean;
  
  import org.junit.*;
  import org.mockito.InOrder;
  
  import io.reactivex.common.*;
  import io.reactivex.common.exceptions.*;
  import io.reactivex.common.functions.*;
  import io.reactivex.common.internal.functions.Functions;
  import io.reactivex.common.internal.utils.ExceptionHelper;
  import io.reactivex.observable.*;
  import io.reactivex.observable.observers.TestObserver;
  import io.reactivex.observable.subjects.PublishSubject;
  
  public class ObservableSwitchTest {
  
      private TestScheduler scheduler;
      private Scheduler.Worker innerScheduler;
      private Observer<String> observer;
  
      @Before
      public void before() {
          scheduler = new TestScheduler();
          innerScheduler = scheduler.createWorker();
          observer = TestHelper.mockObserver();
      }
  
      @Test
      public void testSwitchWhenOuterCompleteBeforeInner() {
          Observable<Observable<String>> source = Observable.unsafeCreate(new ObservableSource<Observable<String>>() {
              @Override
              public void subscribe(Observer<? super Observable<String>> outerObserver) {
                  outerObserver.onSubscribe(Disposables.empty());
                  publishNext(outerObserver, 50, Observable.unsafeCreate(new ObservableSource<String>() {
                      @Override
                      public void subscribe(Observer<? super String> innerObserver) {
                          innerObserver.onSubscribe(Disposables.empty());
                          publishNext(innerObserver, 70, "one");
                          publishNext(innerObserver, 100, "two");
                          publishCompleted(innerObserver, 200);
                      }
                  }));
                  publishCompleted(outerObserver, 60);
              }
          });
  
          Observable<String> sampled = Observable.switchOnNext(source);
          sampled.subscribe(observer);
  
          InOrder inOrder = inOrder(observer);
  
          scheduler.advanceTimeTo(350, TimeUnit.MILLISECONDS);
          inOrder.verify(observer, times(2)).onNext(anyString());
          inOrder.verify(observer, times(1)).onComplete();
      }
  
      @Test
      public void testSwitchWhenInnerCompleteBeforeOuter() {
          Observable<Observable<String>> source = Observable.unsafeCreate(new ObservableSource<Observable<String>>() {
              @Override
              public void subscribe(Observer<? super Observable<String>> outerObserver) {
                  outerObserver.onSubscribe(Disposables.empty());
                  publishNext(outerObserver, 10, Observable.unsafeCreate(new ObservableSource<String>() {
                      @Override
                      public void subscribe(Observer<? super String> innerObserver) {
                          innerObserver.onSubscribe(Disposables.empty());
                          publishNext(innerObserver, 0, "one");
                          publishNext(innerObserver, 10, "two");
                          publishCompleted(innerObserver, 20);
                      }
                  }));
  
                  publishNext(outerObserver, 100, Observable.unsafeCreate(new ObservableSource<String>() {
                      @Override
                      public void subscribe(Observer<? super String> innerObserver) {
                          innerObserver.onSubscribe(Disposables.empty());
                          publishNext(innerObserver, 0, "three");
                          publishNext(innerObserver, 10, "four");
                          publishCompleted(innerObserver, 20);
                      }
                  }));
                  publishCompleted(outerObserver, 200);
              }
          });
  
          Observable<String> sampled = Observable.switchOnNext(source);
          sampled.subscribe(observer);
  
          InOrder inOrder = inOrder(observer);
  
          scheduler.advanceTimeTo(150, TimeUnit.MILLISECONDS);
          inOrder.verify(observer, never()).onComplete();
          inOrder.verify(observer, times(1)).onNext("one");
          inOrder.verify(observer, times(1)).onNext("two");
          inOrder.verify(observer, times(1)).onNext("three");
          inOrder.verify(observer, times(1)).onNext("four");
  
          scheduler.advanceTimeTo(250, TimeUnit.MILLISECONDS);
          inOrder.verify(observer, never()).onNext(anyString());
          inOrder.verify(observer, times(1)).onComplete();
      }
  
      @Test
      public void testSwitchWithComplete() {
          Observable<Observable<String>> source = Observable.unsafeCreate(new ObservableSource<Observable<String>>() {
              @Override
              public void subscribe(Observer<? super Observable<String>> outerObserver) {
                  outerObserver.onSubscribe(Disposables.empty());
                  publishNext(outerObserver, 50, Observable.unsafeCreate(new ObservableSource<String>() {
                      @Override
                      public void subscribe(final Observer<? super String> innerObserver) {
                          innerObserver.onSubscribe(Disposables.empty());
                          publishNext(innerObserver, 60, "one");
                          publishNext(innerObserver, 100, "two");
                      }
                  }));
  
                  publishNext(outerObserver, 200, Observable.unsafeCreate(new ObservableSource<String>() {
                      @Override
                      public void subscribe(final Observer<? super String> innerObserver) {
                          innerObserver.onSubscribe(Disposables.empty());
                          publishNext(innerObserver, 0, "three");
                          publishNext(innerObserver, 100, "four");
                      }
                  }));
  
                  publishCompleted(outerObserver, 250);
              }
          });
  
          Observable<String> sampled = Observable.switchOnNext(source);
          sampled.subscribe(observer);
  
          InOrder inOrder = inOrder(observer);
  
          scheduler.advanceTimeTo(90, TimeUnit.MILLISECONDS);
          inOrder.verify(observer, never()).onNext(anyString());
          verify(observer, never()).onComplete();
          verify(observer, never()).onError(any(Throwable.class));
  
          scheduler.advanceTimeTo(125, TimeUnit.MILLISECONDS);
          inOrder.verify(observer, times(1)).onNext("one");
          verify(observer, never()).onComplete();
          verify(observer, never()).onError(any(Throwable.class));
  
          scheduler.advanceTimeTo(175, TimeUnit.MILLISECONDS);
          inOrder.verify(observer, times(1)).onNext("two");
          verify(observer, never()).onComplete();
          verify(observer, never()).onError(any(Throwable.class));
  
          scheduler.advanceTimeTo(225, TimeUnit.MILLISECONDS);
          inOrder.verify(observer, times(1)).onNext("three");
          verify(observer, never()).onComplete();
          verify(observer, never()).onError(any(Throwable.class));
  
          scheduler.advanceTimeTo(350, TimeUnit.MILLISECONDS);
          inOrder.verify(observer, times(1)).onNext("four");
          verify(observer, never()).onComplete();
          verify(observer, never()).onError(any(Throwable.class));
      }
  
      @Test
      public void testSwitchWithError() {
          Observable<Observable<String>> source = Observable.unsafeCreate(new ObservableSource<Observable<String>>() {
              @Override
              public void subscribe(Observer<? super Observable<String>> outerObserver) {
                  outerObserver.onSubscribe(Disposables.empty());
                  publishNext(outerObserver, 50, Observable.unsafeCreate(new ObservableSource<String>() {
                      @Override
                      public void subscribe(final Observer<? super String> innerObserver) {
                          innerObserver.onSubscribe(Disposables.empty());
                          publishNext(innerObserver, 50, "one");
                          publishNext(innerObserver, 100, "two");
                      }
                  }));
  
                  publishNext(outerObserver, 200, Observable.unsafeCreate(new ObservableSource<String>() {
                      @Override
                      public void subscribe(Observer<? super String> innerObserver) {
                          innerObserver.onSubscribe(Disposables.empty());
                          publishNext(innerObserver, 0, "three");
                          publishNext(innerObserver, 100, "four");
                      }
                  }));
  
                  publishError(outerObserver, 250, new TestException());
              }
          });
  
          Observable<String> sampled = Observable.switchOnNext(source);
          sampled.subscribe(observer);
  
          InOrder inOrder = inOrder(observer);
  
          scheduler.advanceTimeTo(90, TimeUnit.MILLISECONDS);
          inOrder.verify(observer, never()).onNext(anyString());
          verify(observer, never()).onComplete();
          verify(observer, never()).onError(any(Throwable.class));
  
          scheduler.advanceTimeTo(125, TimeUnit.MILLISECONDS);
          inOrder.verify(observer, times(1)).onNext("one");
          verify(observer, never()).onComplete();
          verify(observer, never()).onError(any(Throwable.class));
  
          scheduler.advanceTimeTo(175, TimeUnit.MILLISECONDS);
          inOrder.verify(observer, times(1)).onNext("two");
          verify(observer, never()).onComplete();
          verify(observer, never()).onError(any(Throwable.class));
  
          scheduler.advanceTimeTo(225, TimeUnit.MILLISECONDS);
          inOrder.verify(observer, times(1)).onNext("three");
          verify(observer, never()).onComplete();
          verify(observer, never()).onError(any(Throwable.class));
  
          scheduler.advanceTimeTo(350, TimeUnit.MILLISECONDS);
          inOrder.verify(observer, never()).onNext(anyString());
          verify(observer, never()).onComplete();
          verify(observer, times(1)).onError(any(TestException.class));
      }
  
      @Test
      public void testSwitchWithSubsequenceComplete() {
          Observable<Observable<String>> source = Observable.unsafeCreate(new ObservableSource<Observable<String>>() {
              @Override
              public void subscribe(Observer<? super Observable<String>> outerObserver) {
                  outerObserver.onSubscribe(Disposables.empty());
                  publishNext(outerObserver, 50, Observable.unsafeCreate(new ObservableSource<String>() {
                      @Override
                      public void subscribe(Observer<? super String> innerObserver) {
                          innerObserver.onSubscribe(Disposables.empty());
                          publishNext(innerObserver, 50, "one");
                          publishNext(innerObserver, 100, "two");
                      }
                  }));
  
                  publishNext(outerObserver, 130, Observable.unsafeCreate(new ObservableSource<String>() {
                      @Override
                      public void subscribe(Observer<? super String> innerObserver) {
                          innerObserver.onSubscribe(Disposables.empty());
                          publishCompleted(innerObserver, 0);
                      }
                  }));
  
                  publishNext(outerObserver, 150, Observable.unsafeCreate(new ObservableSource<String>() {
                      @Override
                      public void subscribe(Observer<? super String> innerObserver) {
                          innerObserver.onSubscribe(Disposables.empty());
                          publishNext(innerObserver, 50, "three");
                      }
                  }));
              }
          });
  
          Observable<String> sampled = Observable.switchOnNext(source);
          sampled.subscribe(observer);
  
          InOrder inOrder = inOrder(observer);
  
          scheduler.advanceTimeTo(90, TimeUnit.MILLISECONDS);
          inOrder.verify(observer, never()).onNext(anyString());
          verify(observer, never()).onComplete();
          verify(observer, never()).onError(any(Throwable.class));
  
          scheduler.advanceTimeTo(125, TimeUnit.MILLISECONDS);
          inOrder.verify(observer, times(1)).onNext("one");
          verify(observer, never()).onComplete();
          verify(observer, never()).onError(any(Throwable.class));
  
          scheduler.advanceTimeTo(250, TimeUnit.MILLISECONDS);
          inOrder.verify(observer, times(1)).onNext("three");
          verify(observer, never()).onComplete();
          verify(observer, never()).onError(any(Throwable.class));
      }
  
      @Test
      public void testSwitchWithSubsequenceError() {
          Observable<Observable<String>> source = Observable.unsafeCreate(new ObservableSource<Observable<String>>() {
              @Override
              public void subscribe(Observer<? super Observable<String>> observer) {
                  observer.onSubscribe(Disposables.empty());
                  publishNext(observer, 50, Observable.unsafeCreate(new ObservableSource<String>() {
                      @Override
                      public void subscribe(Observer<? super String> observer) {
                          observer.onSubscribe(Disposables.empty());
                          publishNext(observer, 50, "one");
                          publishNext(observer, 100, "two");
                      }
                  }));
  
                  publishNext(observer, 130, Observable.unsafeCreate(new ObservableSource<String>() {
                      @Override
                      public void subscribe(Observer<? super String> observer) {
                          observer.onSubscribe(Disposables.empty());
                          publishError(observer, 0, new TestException());
                      }
                  }));
  
                  publishNext(observer, 150, Observable.unsafeCreate(new ObservableSource<String>() {
                      @Override
                      public void subscribe(Observer<? super String> observer) {
                          observer.onSubscribe(Disposables.empty());
                          publishNext(observer, 50, "three");
                      }
                  }));
  
              }
          });
  
          Observable<String> sampled = Observable.switchOnNext(source);
          sampled.subscribe(observer);
  
          InOrder inOrder = inOrder(observer);
  
          scheduler.advanceTimeTo(90, TimeUnit.MILLISECONDS);
          inOrder.verify(observer, never()).onNext(anyString());
          verify(observer, never()).onComplete();
          verify(observer, never()).onError(any(Throwable.class));
  
          scheduler.advanceTimeTo(125, TimeUnit.MILLISECONDS);
          inOrder.verify(observer, times(1)).onNext("one");
          verify(observer, never()).onComplete();
          verify(observer, never()).onError(any(Throwable.class));
  
          scheduler.advanceTimeTo(250, TimeUnit.MILLISECONDS);
          inOrder.verify(observer, never()).onNext("three");
          verify(observer, never()).onComplete();
          verify(observer, times(1)).onError(any(TestException.class));
      }
  
      private <T> void publishCompleted(final Observer<T> observer, long delay) {
          innerScheduler.schedule(new Runnable() {
              @Override
              public void run() {
                  observer.onComplete();
              }
          }, delay, TimeUnit.MILLISECONDS);
      }
  
      private <T> void publishError(final Observer<T> observer, long delay, final Throwable error) {
          innerScheduler.schedule(new Runnable() {
              @Override
              public void run() {
                  observer.onError(error);
              }
          }, delay, TimeUnit.MILLISECONDS);
      }
  
      private <T> void publishNext(final Observer<T> observer, long delay, final T value) {
          innerScheduler.schedule(new Runnable() {
              @Override
              public void run() {
                  observer.onNext(value);
              }
          }, delay, TimeUnit.MILLISECONDS);
      }
  
      @Test
      public void testSwitchIssue737() {
          // https://github.com/ReactiveX/RxJava/issues/737
          Observable<Observable<String>> source = Observable.unsafeCreate(new ObservableSource<Observable<String>>() {
              @Override
              public void subscribe(Observer<? super Observable<String>> outerObserver) {
                  outerObserver.onSubscribe(Disposables.empty());
                  publishNext(outerObserver, 0, Observable.unsafeCreate(new ObservableSource<String>() {
                      @Override
                      public void subscribe(Observer<? super String> innerObserver) {
                          innerObserver.onSubscribe(Disposables.empty());
                          publishNext(innerObserver, 10, "1-one");
                          publishNext(innerObserver, 20, "1-two");
                          // The following events will be ignored
                          publishNext(innerObserver, 30, "1-three");
                          publishCompleted(innerObserver, 40);
                      }
                  }));
                  publishNext(outerObserver, 25, Observable.unsafeCreate(new ObservableSource<String>() {
                      @Override
                      public void subscribe(Observer<? super String> innerObserver) {
                          innerObserver.onSubscribe(Disposables.empty());
                          publishNext(innerObserver, 10, "2-one");
                          publishNext(innerObserver, 20, "2-two");
                          publishNext(innerObserver, 30, "2-three");
                          publishCompleted(innerObserver, 40);
                      }
                  }));
                  publishCompleted(outerObserver, 30);
              }
          });
  
          Observable<String> sampled = Observable.switchOnNext(source);
          sampled.subscribe(observer);
  
          scheduler.advanceTimeTo(1000, TimeUnit.MILLISECONDS);
  
          InOrder inOrder = inOrder(observer);
          inOrder.verify(observer, times(1)).onNext("1-one");
          inOrder.verify(observer, times(1)).onNext("1-two");
          inOrder.verify(observer, times(1)).onNext("2-one");
          inOrder.verify(observer, times(1)).onNext("2-two");
          inOrder.verify(observer, times(1)).onNext("2-three");
          inOrder.verify(observer, times(1)).onComplete();
          inOrder.verifyNoMoreInteractions();
      }
  
      @Test
      public void testUnsubscribe() {
          final AtomicBoolean isUnsubscribed = new AtomicBoolean();
          Observable.switchOnNext(
                  Observable.unsafeCreate(new ObservableSource<Observable<Integer>>() {
                      @Override
                      public void subscribe(final Observer<? super Observable<Integer>> observer) {
                          Disposable bs = Disposables.empty();
                          observer.onSubscribe(bs);
                          observer.onNext(Observable.just(1));
                          isUnsubscribed.set(bs.isDisposed());
                      }
                  })
          ).take(1).subscribe();
          assertTrue("Switch doesn't propagate 'unsubscribe'", isUnsubscribed.get());
      }
      /** The upstream producer hijacked the switch producer stopping the requests aimed at the inner observables. */
      @Test
      public void testIssue2654() {
          Observable<String> oneItem = Observable.just("Hello").mergeWith(Observable.<String>never());
  
          Observable<String> src = oneItem.switchMap(new Function<String, Observable<String>>() {
              @Override
              public Observable<String> apply(final String s) {
                  return Observable.just(s)
                          .mergeWith(Observable.interval(10, TimeUnit.MILLISECONDS)
                          .map(new Function<Long, String>() {
                              @Override
                              public String apply(Long i) {
                                  return s + " " + i;
                              }
                          })).take(250);
              }
          })
          .share()
          ;
  
          TestObserver<String> ts = new TestObserver<String>() {
              @Override
              public void onNext(String t) {
                  super.onNext(t);
                  if (valueCount() == 250) {
                      onComplete();
                      dispose();
                  }
              }
          };
          src.subscribe(ts);
  
          ts.awaitTerminalEvent(10, TimeUnit.SECONDS);
  
          System.out.println("> testIssue2654: " + ts.valueCount());
  
          ts.assertTerminated();
          ts.assertNoErrors();
  
          Assert.assertEquals(250, ts.valueCount());
      }
  
  
      @Test
      public void delayErrors() {
          PublishSubject<ObservableSource<Integer>> source = PublishSubject.create();
  
          TestObserver<Integer> ts = source.switchMapDelayError(Functions.<ObservableSource<Integer>>identity())
          .test();
  
          ts.assertNoValues()
          .assertNoErrors()
          .assertNotComplete();
  
          source.onNext(Observable.just(1));
  
          source.onNext(Observable.<Integer>error(new TestException("Forced failure 1")));
  
          source.onNext(Observable.just(2, 3, 4));
  
          source.onNext(Observable.<Integer>error(new TestException("Forced failure 2")));
  
          source.onNext(Observable.just(5));
  
          source.onError(new TestException("Forced failure 3"));
  
          ts.assertValues(1, 2, 3, 4, 5)
          .assertNotComplete()
          .assertError(CompositeException.class);
  
          List<Throwable> errors = ExceptionHelper.flatten(ts.errors().get(0));
  
          TestCommonHelper.assertError(errors, 0, TestException.class, "Forced failure 1");
          TestCommonHelper.assertError(errors, 1, TestException.class, "Forced failure 2");
          TestCommonHelper.assertError(errors, 2, TestException.class, "Forced failure 3");
      }
  
      @Test
      public void switchOnNextDelayError() {
          PublishSubject<Observable<Integer>> ps = PublishSubject.create();
  
          TestObserver<Integer> ts = Observable.switchOnNextDelayError(ps).test();
  
          ps.onNext(Observable.just(1));
          ps.onNext(Observable.range(2, 4));
          ps.onComplete();
  
          ts.assertResult(1, 2, 3, 4, 5);
      }
  
      @Test
      public void switchOnNextDelayErrorWithError() {
          PublishSubject<Observable<Integer>> ps = PublishSubject.create();
  
          TestObserver<Integer> ts = Observable.switchOnNextDelayError(ps).test();
  
          ps.onNext(Observable.just(1));
          ps.onNext(Observable.<Integer>error(new TestException()));
          ps.onNext(Observable.range(2, 4));
          ps.onComplete();
  
          ts.assertFailure(TestException.class, 1, 2, 3, 4, 5);
      }
  
      @Test
      public void switchOnNextDelayErrorBufferSize() {
          PublishSubject<Observable<Integer>> ps = PublishSubject.create();
  
          TestObserver<Integer> ts = Observable.switchOnNextDelayError(ps, 2).test();
  
          ps.onNext(Observable.just(1));
          ps.onNext(Observable.range(2, 4));
          ps.onComplete();
  
          ts.assertResult(1, 2, 3, 4, 5);
      }
  
      @Test
      public void switchMapDelayErrorEmptySource() {
          assertSame(Observable.empty(), Observable.<Object>empty()
                  .switchMapDelayError(new Function<Object, ObservableSource<Integer>>() {
                      @Override
                      public ObservableSource<Integer> apply(Object v) throws Exception {
                          return Observable.just(1);
                      }
                  }, 16));
      }
  
      @Test
      public void switchMapDelayErrorJustSource() {
          Observable.just(0)
          .switchMapDelayError(new Function<Object, ObservableSource<Integer>>() {
              @Override
              public ObservableSource<Integer> apply(Object v) throws Exception {
                  return Observable.just(1);
              }
          }, 16)
          .test()
          .assertResult(1);
      }
  
      @Test
      public void switchMapErrorEmptySource() {
          assertSame(Observable.empty(), Observable.<Object>empty()
                  .switchMap(new Function<Object, ObservableSource<Integer>>() {
                      @Override
                      public ObservableSource<Integer> apply(Object v) throws Exception {
                          return Observable.just(1);
                      }
                  }, 16));
      }
  
      @Test
      public void switchMapJustSource() {
          Observable.just(0)
          .switchMap(new Function<Object, ObservableSource<Integer>>() {
              @Override
              public ObservableSource<Integer> apply(Object v) throws Exception {
                  return Observable.just(1);
              }
          }, 16)
          .test()
          .assertResult(1);
  
      }
  
  
      @Test
      public void switchMapInnerCancelled() {
          PublishSubject<Integer> pp = PublishSubject.create();
  
          TestObserver<Integer> ts = Observable.just(1)
                  .switchMap(Functions.justFunction(pp))
                  .test();
  
          assertTrue(pp.hasObservers());
  
          ts.cancel();
  
          assertFalse(pp.hasObservers());
      }
  
      @Test
      public void switchMapSingleJustSource() {
          Observable.just(0)
          .switchMapSingle(new Function<Object, SingleSource<Integer>>() {
              @Override
              public SingleSource<Integer> apply(Object v) throws Exception {
                  return Single.just(1);
              }
          })
          .test()
          .assertResult(1);
      }
  
      @Test
      public void switchMapSingleMapperReturnsNull() {
          Observable.just(0)
          .switchMapSingle(new Function<Object, SingleSource<Integer>>() {
              @Override
              public SingleSource<Integer> apply(Object v) throws Exception {
                  return null;
              }
          })
          .test()
          .assertError(NullPointerException.class);
      }
  
      @Test(expected = NullPointerException.class)
      public void switchMapSingleMapperIsNull() {
          Observable.just(0)
          .switchMapSingle(null);
      }
  
      @Test
      public void switchMapSingleFunctionDoesntReturnSingle() {
          Observable.just(0)
          .switchMapSingle(new Function<Object, SingleSource<Integer>>() {
              @Override
              public SingleSource<Integer> apply(Object v) throws Exception {
                  return new SingleSource<Integer>() {
                      @Override
                      public void subscribe(SingleObserver<? super Integer> s) {
                          s.onSubscribe(Disposables.empty());
                          s.onSuccess(1);
                      }
                  };
              }
          })
          .test()
          .assertResult(1);
      }
  
      @Test
      public void switchMapSingleDelayErrorJustSource() {
          final AtomicBoolean completed = new AtomicBoolean();
          Observable.just(0, 1)
          .switchMapSingleDelayError(new Function<Integer, SingleSource<Integer>>() {
              @Override
              public SingleSource<Integer> apply(Integer v) throws Exception {
                  if (v == 0) {
                      return Single.error(new RuntimeException());
                  } else {
                      return Single.just(1).doOnSuccess(new Consumer<Integer>() {
  
                          @Override
                          public void accept(Integer n) throws Exception {
                              completed.set(true);
                          }});
                  }
              }
          })
          .test()
          .assertValue(1)
          .assertError(RuntimeException.class);
          assertTrue(completed.get());
      }
  
      @Test
      public void scalarMap() {
          Observable.switchOnNext(Observable.just(Observable.just(1)))
          .test()
          .assertResult(1);
      }
  
      @Test
      public void scalarMapDelayError() {
          Observable.switchOnNextDelayError(Observable.just(Observable.just(1)))
          .test()
          .assertResult(1);
      }
  
      @Test
      public void dispose() {
          TestHelper.checkDisposed(Observable.switchOnNext(
                  Observable.just(Observable.just(1)).hide()));
      }
  
      @Test
      public void nextSourceErrorRace() {
          for (int i = 0; i < 500; i++) {
              List<Throwable> errors = TestCommonHelper.trackPluginErrors();
              try {
  
                  final PublishSubject<Integer> ps1 = PublishSubject.create();
                  final PublishSubject<Integer> ps2 = PublishSubject.create();
  
                  ps1.switchMap(new Function<Integer, ObservableSource<Integer>>() {
                      @Override
                      public ObservableSource<Integer> apply(Integer v) throws Exception {
                          if (v == 1) {
                              return ps2;
                          }
                          return Observable.never();
                      }
                  })
                  .test();
  
                  Runnable r1 = new Runnable() {
                      @Override
                      public void run() {
                          ps1.onNext(2);
                      }
                  };
  
                  final TestException ex = new TestException();
  
                  Runnable r2 = new Runnable() {
                      @Override
                      public void run() {
                          ps2.onError(ex);
                      }
                  };
  
                  TestCommonHelper.race(r1, r2);
  
                  for (Throwable e : errors) {
                      assertTrue(e.toString(), e instanceof TestException);
                  }
              } finally {
                  RxJavaCommonPlugins.reset();
              }
          }
      }
  
      @Test
      public void outerInnerErrorRace() {
          for (int i = 0; i < 500; i++) {
              List<Throwable> errors = TestCommonHelper.trackPluginErrors();
              try {
  
                  final PublishSubject<Integer> ps1 = PublishSubject.create();
                  final PublishSubject<Integer> ps2 = PublishSubject.create();
  
                  ps1.switchMap(new Function<Integer, ObservableSource<Integer>>() {
                      @Override
                      public ObservableSource<Integer> apply(Integer v) throws Exception {
                          if (v == 1) {
                              return ps2;
                          }
                          return Observable.never();
                      }
                  })
                  .test();
  
                  final TestException ex1 = new TestException();
  
                  Runnable r1 = new Runnable() {
                      @Override
                      public void run() {
                          ps1.onError(ex1);
                      }
                  };
  
                  final TestException ex2 = new TestException();
  
                  Runnable r2 = new Runnable() {
                      @Override
                      public void run() {
                          ps2.onError(ex2);
                      }
                  };
  
                  TestCommonHelper.race(r1, r2);
  
                  for (Throwable e : errors) {
                      assertTrue(e.toString(), e instanceof TestException);
                  }
              } finally {
                  RxJavaCommonPlugins.reset();
              }
          }
      }
  
      @Test
      public void nextCancelRace() {
          for (int i = 0; i < 500; i++) {
              final PublishSubject<Integer> ps1 = PublishSubject.create();
  
              final TestObserver<Integer> to = ps1.switchMap(new Function<Integer, ObservableSource<Integer>>() {
                  @Override
                  public ObservableSource<Integer> apply(Integer v) throws Exception {
                      return Observable.never();
                  }
              })
              .test();
  
              Runnable r1 = new Runnable() {
                  @Override
                  public void run() {
                      ps1.onNext(2);
                  }
              };
  
              Runnable r2 = new Runnable() {
                  @Override
                  public void run() {
                      to.cancel();
                  }
              };
  
              TestCommonHelper.race(r1, r2);
          }
      }
  
      @Test
      public void mapperThrows() {
          Observable.just(1).hide()
          .switchMap(new Function<Integer, ObservableSource<Object>>() {
              @Override
              public ObservableSource<Object> apply(Integer v) throws Exception {
                  throw new TestException();
              }
          })
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void badMainSource() {
          List<Throwable> errors = TestCommonHelper.trackPluginErrors();
          try {
              new Observable<Integer>() {
                  @Override
                  protected void subscribeActual(Observer<? super Integer> observer) {
                      observer.onSubscribe(Disposables.empty());
                      observer.onComplete();
                      observer.onError(new TestException());
                      observer.onComplete();
                  }
              }
              .switchMap(Functions.justFunction(Observable.never()))
              .test()
              .assertResult();
  
              TestCommonHelper.assertUndeliverable(errors, 0, TestException.class);
          } finally {
              RxJavaCommonPlugins.reset();
          }
      }
  
      @Test
      public void emptyInner() {
          Observable.range(1, 5)
          .switchMap(Functions.justFunction(Observable.empty()))
          .test()
          .assertResult();
      }
  
      @Test
      public void justInner() {
          Observable.range(1, 5)
          .switchMap(Functions.justFunction(Observable.just(1)))
          .test()
          .assertResult(1, 1, 1, 1, 1);
      }
  
      @Test
      public void badInnerSource() {
          List<Throwable> errors = TestCommonHelper.trackPluginErrors();
          try {
              Observable.just(1).hide()
              .switchMap(Functions.justFunction(new Observable<Integer>() {
                  @Override
                  protected void subscribeActual(Observer<? super Integer> observer) {
                      observer.onSubscribe(Disposables.empty());
                      observer.onError(new TestException());
                      observer.onComplete();
                      observer.onError(new TestException());
                      observer.onComplete();
                  }
              }))
              .test()
              .assertFailure(TestException.class);
  
              TestCommonHelper.assertUndeliverable(errors, 0, TestException.class);
          } finally {
              RxJavaCommonPlugins.reset();
          }
      }
  
      @Test
      public void innerCompletesReentrant() {
          final PublishSubject<Integer> ps = PublishSubject.create();
  
          TestObserver<Integer> to = new TestObserver<Integer>() {
              @Override
              public void onNext(Integer t) {
                  super.onNext(t);
                  ps.onComplete();
              }
          };
  
          Observable.just(1).hide()
          .switchMap(Functions.justFunction(ps))
          .subscribe(to);
  
          ps.onNext(1);
  
          to.assertResult(1);
      }
  
      @Test
      public void innerErrorsReentrant() {
          final PublishSubject<Integer> ps = PublishSubject.create();
  
          TestObserver<Integer> to = new TestObserver<Integer>() {
              @Override
              public void onNext(Integer t) {
                  super.onNext(t);
                  ps.onError(new TestException());
              }
          };
  
          Observable.just(1).hide()
          .switchMap(Functions.justFunction(ps))
          .subscribe(to);
  
          ps.onNext(1);
  
          to.assertFailure(TestException.class, 1);
      }
  }
  